Model Number:The Puma Women's PE Running LS HZ Tee is an excellent layering piece. Built with coolCELL fabric technology, this 1/2 zip provides moisture management to keep you dry during your run, and strategically placed mesh panels throughout increase ventilation to keep you cool and comfortable. Articulated arms and carefully placed seam lines provide increases freedom of movement. Flatlock seams help protect from chafing. Reflective details improve visibility in low-light settings.